Short wave antenna



Sept. 22, 1936.

A. GOTHE SHORT WAVE ANTENNA Filed Sept. 25. 1953 INVENTOR ALBRECHT GOTHE ATTORNEY Patented Sept. 22, 1936 UNITED STATES PATENT OFFICE SHORT WAVE ANTENNA tion of Germany Application September 25, 1933, Serial No. 690,827 In Germany October 1, 1932 4 Claims. (Cl. 250-11) In general, short wave directional antennae consist .of combinations of single dipoles made of flexible wire. These are insulated from each other and from the supporting mounting by 5 means of insulators which are usually located at the ends of the dipoles, that is, at places at which the voltage is a maximum. In such cases, it has been found that the shorter the wave the greater are the losses in the insulators.

According to the present invention, directional antennae for very short waves, i. e., waves below 10 meters, are composed of rigid wires or pipes supported by insulators at the voltage nodal point. An example of such an antenna constructed in 15 accordance with the principles of the present invention is shown in the accompanying drawing in which D designates a plurality of horizontal radiating dipoles, L is the feed line, and I is the insulators. The insulators are preferably rigid 20 and, in the preferred form, consist of tensioned insulator chains. Although horizontal dipoles are shown, it will be understood, of course, that the invention applies equally as well to vertical and inclined dipoles. In all cases the essential feature resides in the fact that the insulators are provided substantially at voltage nodal points and not at places of high voltage.

If desired, there may be placed at the back of the antenna a homogeneous reflector for efiecting unidirectional radiation. If a transportable antenna arrangement is required the arrangement can be built so as to be easily demountable. The single conductors in such case can be connected to each other telescopically, or by clamping or screwing.

I claim:

1. In combination, an antenna system comprising two rigid coaxially arranged arms, each one 5 half wave length long, and rigid means for supporting each arm substantially at its midpoint.

2. In combination, an antenna system comprising two rigid arms, each substantially an odd multiple .of a half wave length long, and rigid insulating means for supporting each arm at a voltage nodal point.

3. In combination, an antenna system comprising a dipole having two rigid arms, high frequency apparatus, a two conductor line extending from said high frequency apparatus to said two arms of said dipole, and rigid insulating means for supporting each arm at a voltage nodal point substantially an odd multiple of a quarter wave length from the junction point of said arm with said line.

4. In combination, an antenna system comprising coaxially horizontally arranged rigid arms, each substantially one-half wave length long, a similar pair of horizontal arms spaced away from said first pair in a vertical plane, high frequency apparatus, a two conductor transmission line extending from said high frequency apparatus to the adjacent ends of one of said pairs, crossed connections between said ends and the adjacent 0 ends of said other pair of arms, and rigid means for supporting each arm substantially at its midpoint.

ALBRECHT GOTHE. 

